问题标题:
初二数学整式题(x+4)(x+9)=x^2+mx+36(x-2)(x-18)=x^2+mx+36(x+3)(x+p)=x^2+mx+36(x-6)(x-p)=x^2+mx+36(x+p)(x+q)=x^2+mx+36p、q为正整数,求m
问题描述:
初二数学整式题
(x+4)(x+9)=x^2+mx+36
(x-2)(x-18)=x^2+mx+36
(x+3)(x+p)=x^2+mx+36
(x-6)(x-p)=x^2+mx+36
(x+p)(x+q)=x^2+mx+36
p、q为正整数,求m
廖仁回答:
由已知
1.(x+4)(x+9)=x^2+13x+36=x^2+mx+36故m=13
2.(x-2)(x-18)=x^2-20x+36=x^2+mx+36故m=-20
3.(x+3)(x+p)=x^2+mx+36故p=12m=15
4.(x-6)(x-p)=x^2+mx+36故p=6m=-12
5.(x+p)(x+q)=x^2+mx+36故p+q=mpq=36
∴p=1q=36m=37或p=2q=18m=20或p=3q=12m=15或p=4q=9m=13或p=q=6m=12或p=9q=4m=13或p=12q=3m=18或p=18q=2m=20或p=36q=1m=37
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